Our basic yet powerful multilayer reinforcement mechanism reveals the dramatic promoting impacts of complex social contagion on multiplex networks, which indicates the possibility of facilitating spread outbreaks via controlling initial spreaders. These insights are in line with the empirical studies that only large initial density of adopters can successfully initiate social changes [1]}. Our work not only provides a novel analytical framework, but also pave ways in many real-world applications, including spreading public health behaviors, promoting new ideas and marketing.
